
import org.hibernate.Session;

public class UserManager {
 private Session session = null;
 public UserManager(Session session) {
  if(session == null)
    throw new 
      RuntimeException("Invalid session object.");
  this.session = session;
 }
 public void saveUser(User user){
  session.save(user);
 }
 public void updateUser(User user){
  session.update(user);
 }
 public void deleteUser(User user) {
  session.delete(user);
 }
}
